1; I want to underplant sedum autumn fire with a spring/early summer blooming bulb like allium. Has to be atleast 2 feet tall. Is this a bad idea? What if I did that with an echinacea such as Primadonna white?
2; I planted a couple of Sedum autumn charm. Its a beautiful variegated sedum planted in full sun with some afternoon shade in a raised bed with mostly clay soil. After two-three weeks, they show browning of leaf edges and one has dropped lot of leaves and when I pulled one of the stems, it came right out of the ground. The soil does not appear too wet......I don't water too frequently since I know sedum don't need a lot of water but it is clay soil......so the question is too much water or too little?